THE NERVOUS TISSUE. 



1123 



Other authors describe the artery as entering the corpuscle at the pole opposite to 

 the nerve-fibre. 



Herbst has described a somewhat similar "nerve-ending" to the Pacinian 

 corpuscle, as being found in the mucous membrane of the tongue of the duck and 

 in some other situations. It differs, however, from the Pacinian corpuscles, in 

 being smaller, its capsules thinner and more closely approximated, and especially 

 in the fact that the axis-cylinder in the central clear space is coated with a con- 

 tinuous row of nuclei. These bodies are known as the corpuscles of Herbst. 



Organ of Golgi, showing Tendon bundles. 



ramification of nerve-fibrils. 

 Muscular fibres. 

 FIG. 661. Organ of Golgi (neuro-tendinous spindle) from the human tendon Achillis. (After Ciaccio.) 



Neuro-tendinous spindles. The nerves supplying tendons have a special modifi- 

 cation of the terminal fibres, especially numerous at the point where the tendon is 

 becoming muscular. The tendon bundles become enlarged, and the nerve-fibres 

 one, two, or more in number penetrate between the fasciculi of the tendon and 

 spread out between the fibres toend in irregular discs or varicosities. A spindle- 

 shaped body is thus formed, composed of tendon bundles and nerve-fibres, which 

 is known as the organ of Golgi (Fig. 661). 



Dendritic branchings. 



Rings. 



Spirals.; 

 FIG. 662. Middle third of a terminal plaque in the muscle spindle of an adult cat. (After Ruffini.) 



Neuro-muscular spindles. In the majority of voluntary muscles there have 

 been found special end-organs consisting of a small bundle of peculiar muscular 

 fibres (intrafusal fibres), embryonic in type, invented by a capsule within which 



